Add a PowerTopology class to aid replica placement and enhance availability of
blocks
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Key: HADOOP-4554
URL: https://issues.apache.org/jira/browse/HADOOP-4554
Project: Hadoop Core
Issue Type: New Feature
Reporter: Jeff Hammerbacher
Priority: Minor
Power outages are a common reason for a DataNode to become unavailable. Having
a data structure to represent to the power topology of your data center can be
used to implement a power-aware replica placement policy.
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